NORD Drivesystems BU0230 - Manual (Page 7)

1 General
BU 0230 GB-2712 7
1 General
This manual BU 0230 DE describes the aspects that are directly related to the functional safety of the
equipment. All standard functions and parameters of the inverter are contained in the Manual (BU 0200 GB).
1.1 Safety and installation information
SK 2xxE frequency inverters are devices for use in industrial high voltage systems and are operated at
voltages that could lead to severe injuries or death if they are touched.

Installation and other work may only be carried out by qualified electricians and with the device
disconnected. The operating instructions must always be available to these persons and must be
strictly observed by them.

Local regulations for the installation of electrical equipment and accident prevention must be
complied with.

The equipment continues to carry hazardous voltages for up to 5 minutes after being switched off
at the mains. The equipment may only be opened or the cover or control element removed 5
minutes after the equipment has been disconnected from the power supply. All covers must be put
back in place before the mains voltage is switched back on again.

For single phase operation (115/230 V) the mains impedance must be at least 100

H for each
conductor. If this is not the case, a mains choke must be installed.

For safe isolation from the mains, all poles of the supply cable to the frequency inverter must be
able to be disconnected.

Even during motor standstill (e.g. caused by an electronic block, blocked drive or output terminal
short circuit), the line connection terminals, motor terminals and braking resistor terminals may still
conduct hazardous voltages. A motor standstill is not identical to electrical isolation from the mains.

Parts of the control board, and especially the connector socket for the removable technology units
also carry hazardous voltages. The control terminals are mains voltage free.

Note: with certain settings, the frequency inverter can start up automatically after the mains are
switched on.

The circuit boards contain highly-sensitive MOS semiconductor components that are particularly
sensitive to static electricity. Avoid touching circuit tracks and components with the hand or metallic
objects. Only the terminal strip screws may be touched with insulated screwdrivers when
connecting the cables.

The frequency inverter is only intended for permanent connection and may not be operated without
effective earthing connections which comply with the local regulations for large leakage currents
(> 3.5 mA). EN 50178/VDE 0160 stipulates the installation of a second earthing conductor or an
earthing conductor cross-section of at least 10 mm
2
.

A universal leakage current-sensitive circuit breaker - (type B) compliant with EN 50178/
VDE 0160 must be used.

In normal use, SK2xxE frequency inverters are maintenance free if used correctly. The cooling
surfaces must be regularly cleaned with compressed air if the ambient air is dusty.

The frequency inverters are suitable for operation on TN or TT networks and with observation of
the measures described in the manual for the frequency inverter, they are also suitable for IT
networks.